Feed mechanism for sewing-machines.



No. 693,656.- f, H. A. KLEMM.

` FEED'MECHANISM FUR SEWING MACHINES.

(Application med sept. 9. l1901.)

(No Model.)

Y lce. f Y uw@ 7x0@ UNI- TED 'STAT-ES- PATENT Genres.

.HERMANN A. KLEMM, on NEW YORK, N. i

4FEED ,MEC H N l s- M FOR s t-:wlN c-MACH IN las'.

f l srncirrcnrmiv forming part orLetteps-'raeatnq ee3,c5e,. aaed Feipnaryia i902'. i Applications@september9.i901.. stan-vitamina. 'nomaden 4.'-l'o. alZZ when@ ritmi/wy concern/:1 i Be it known that I', HERMANN A. fKLEni/ga citizen of the United States of America-and e .fi/resident of New Yorkcity, county and State 5' of- New York, have invented certain new and.

useful Improvements in Feed Mechanismffor l Sewing-Machines, of which the followings a specification. f

i My -invention relates i to differentialffeed.

ijo'mechanism of the characterused fol-feeding 'f knit and other likelooselydnter m'eshed elastic- 'fabrics in sewngfma'chines to prevent stretch- 1 ling,thefabrcs bythe vaction of the feed-dog, andthus tovavoid the puckeringcommon in 15 such goods when'positive-feed devices are employed, the said improvements-consisting of the constructions,l combinations, and `ar-v rangements of mechanism adapted for both f dierentialand positive operation, as here in' zo" afterdescribed, reference being'made to the .i accompanying drawings,l in .whichlevenand' `rode are coupled-together adjust- Figure 1 isa vertical' section of part of a. i "-sewingemachine*provided with-my' 'improved' 7` feed mechanism', the section being taken in a represented as adjusted 'for the differential middleof the forward movement. Fig 3 is also asimilar section with the parts adj usted forvpositive feed and inthe position for beginning theforward movement, Fig. 4 is a 5 detailinvertical section on line 2'2 of Fig-1 'fr iArepresents theinain shaft; '0.,' the-feed# dog-carrying bar, 'said bar being mounted Aon the eccentrica, carried by the main shaft, for imparting' the vertical movements ofthe feed-I .dog andsaid bar being connected to the rocklever dipforbeing -reciprocated, and said rock;

lever isconneeted by a rod e'to anotherec'centr-iotnotshown) onthe shaft A.- Said rockkleed movements;

i iEmpresas.che-template:wiepress@ positively feeding the Vfabric..4v g

slideway o of thehfeed-bar a, and the part j has limited and it also has forwardand-backward move.,- Vment with saidbar'. Z is interposed between` the two parts of the ithefeed-line.;` tlieforward part'tbeing xedly. 1

.attachedto the upper side of the forward partv f s s sliding movement -onsaid bar toward and 1 t rfrom-part t', being mounted in a slidewaylc,v

A spirallycoiled spring.'l v 6o ,j feed-dog, tending to separate them, as'shown in Fig. 1, said spring bcin'glocated in a socket fm of one of the parts as the means of mcunt-4 1 ing said 4spring and also to 'enablethe spring to be compressed entirelywithin the socket to-permit the two parts ofthe' dogto have positive contact with eachother, 4as shown inl Figs., 2 and 3; when theyare. 4to-'be usedfor V'A plunger fn, .located in abo'red of the bed-plate p of the machine, bears at fone end against therear .end of the sliding part j of thefeed-dog, and a spirally-coiled'- spring' (1 suitably .fitted on the plunger be-` tween a collars and.- a plug t in an enlarged section of the slidew'ay,' ,normally presses the plunger againstithe rear end of the part j of the feed-dog. An adj usting-nut u on a screwthreaded extension of the plunger through 'plug #controls the` action of the plunger.

The plug has -a slotted head w, in which a, radially-projecting pin a: of the plunger holds the plunger against turning while the adj ust-' ling-nut u is being turned. The power of thev spring q'is su-eiently greater-than the power` of spring Z to maintain positive'contactofpart-j of therfejed-dog with part t' of said dog parts oft-he doggth'en act together as one and' -drawingsff For the diferentialloperation ofthe feeddogy theadjusting-nuiru is set back, as in. Figs. 1 ;andj2,v so as to-relievethe vparty ofthe feeddog of the full elect orthrow of spring q, allowing s ring Z to, shift'part j' ahead ofv grst part of the forward stroke i4 l i against the endof 4plunger nj-'as show-n in'Fig.

g -indicatestheneedle, andh a piece of fabpart 'i in .the

when' adjusting-nut yu is set` forward. suifciently fonfree action-of spring q. The-two j feed.positively as if constructed in one piece. This adjustment is shown in Fig. 3 ofthe same timefeeds the part of the fabric subject to it. f Part t of the'feed-dog then compresses roo 1, where `it will rest l duringthe rstpartof .the forwardstroke of 'part t; which at the:

spring Z and positive contact of the two parts of the `feed-dog occurs. The two parts act in unison during the rest of the stroke, pushing plunger n back against spring q, the adjusting-nut u being free to be shifted along with the plunger in that direction. Thus with a feed-dog adapted for positive feed in the usual way the machine is' also equippedwith adierenti'al feed mechanism, such as is found useful in feeding knit and other elasticgoods, by overfeeding'at the forward part of the feedidog to compensate for the stretching to which such goo-ds are liablein thecommon non-compensating feed mechanisms and which results in unsatisfactory .nuckered seams. What I claim as my invention is 'The combination with the positively-moving part and the Vaniably-moving part of the August, 1901.

feed-dog, and with the spring intermediate of said parts for causing the variable movement, o'i the plunger acting on said movable part in opposition vto the action ofthe intermediate spring, the plunger-actuating spring,` said spring having greater power than the intermediate spring, and the adusting-nut, said nutadaptedto limit the action of the plunger on thevariably-nioving part of the feed-dog, also to allow positive connection of the two parts of the feed-dog by the plunger, and also to allow positive unlimited lmevements of the two parts together.

' signed an New York @uy this 20th day of;

HERMANN A. KLEMM.

Witnesses: l v

A. PfTHAYER, C. SEDGWICK. 

